System of control



P. L. MARDIS.

SYSTEM OF CONTROL. APPLICATION FILED FEB, 13, 1917.

1,355,490. Patentafi 0st. 112 19m,

INVENTOR I 1000/ L. Ward/s "111W 1 My 6/ Wu ATTORNEY (2 WiTNES SES:

UNITED STATES PATENT OFFICE.

PAUL L. MAR/DIS, OF \VILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OLE PENNSYLVANIA.

SYSTEM OF CONTROL.

Application filed February 18, 1917.

T all whom it may concern.

Be it known that I, PAUL L. Manors, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Systems of Control, or" which the following is a specification.

My invention relates to systems of control and particularly to systems of control for electric railway vehicles.

One object of my invention is to provide a control system of the above indicated character which shall energize and operate various signaling means and electrically operated switches in a safe and economical manner.

Another object of my invention is to provide a control system of the above indicated character with a line switch for connecting a motor across the supply circuit, which shall be provided with an energizing coil that is connected in shunt to a portion of a plurality of resistors which are connected across the supply circuit, and means com prising a controller and a plurality of interlock switches associated with the vehicle doors for selectively controlling the energization of said line-switch coil.

Another object or" my invention is to provide a control system of the above indicated character which shall be provided with a trip switch that is disposed in circuit with the coil of the line switch and is provided with an energizing coil which is disposed in series with the propelling motor of the ve hicle, and a holding coil which is adapted to be energized in shunt to a portion of a plurality of resistors.

A further object of my invention is to provide a control system for an electric railway vehicle which shall have a line switch that connects a motor across the supply circuit and is associated with an auxiliary interlock switch to efi'ect reduction of the voltage supplied to the line-switch coil when the latter is energized, and means for operating signal lights and for preventing the operation of the vehicle when one of the vehicle doors is open.

In the prior art, systems of the above indicated character are disclosed in-w rich the Specification of Letters Patent.

Patented Oct. 12, 1920. Serial No. 148,431.

various interlock switches are adapted to break the full line voltage when opened, and the coils of the various switches and signal lights are connected in series with resistors across the supply circuit.

According to my invention, the coils of the various switches that serve to control the operation of the system are energized in shunt to a portion of a plurality of resistors which are connected across the supply circuit, and the various interlock switches, which are operated by the doors of the vehicle, serve to break currents at reduced voltages.

Figure 1 of theaccompanying drawing is a diagrammatic view of acontrol system constructed in accordance with my inven tion, Fig. 9. is a diagrammatic view illustrating the relation of the door-interlock switches which are associated with one of the vehicle doors, Fig. ,3. is a diagrammatic viewot the line switch,and Fig. 4 is a simplified perspective view of a slip-segment employed in connection with my invention.

Referring to Fig. 1 of the accompanying drawing, two motors M1 and M2 are connected across a supply circuit, comprising a trolley conductor 1 and a ground return conductor g, by means of a line switch LS, and are accelerated by means of a controller. MC which excludes a resistor 2 from the circuit of the motors in a step-by-st-ep manner. The controller MC embodies a movable contact segment 3 which is adapted to engage the contact fingers 4 to 7, inclusive, when moved through positions a, and 0,.and an interlock switch 8, for completing circuit through the coil of the line switch when the controller is in position a. The controller is further provided with a slip segment 9 shown in Fig. 1, of the type disclosed in the application of N.- lV. Storer, Serial No. 774,394, filed June 18, 1913, patented Sept. 11. 191. No. 1,239,840, and assigned to tl e /Vestinghouse Electric & Manufacturing Company. The slip segment 9 serves to connect a plurality of resistors 10, 11 and 12 across the supply conductors 1 and y when the master controller is moved in a forward direction and to break the circuit of the resistors when the master controller ismoved tance. As the operation of the slip segment is well-known in the art and is fully desame .in detail.

- The line switch LS is provided with a coil 13 which is adapted to be'connected in shuntto the resistor 12 by means of the drum interlock switch 8 and two door interlock switches '14: and 15, when an overload trip.

switch OTis in the released position. The line switch is provided with two interlock switches LS-out and LS-i n which are respectively adapted toclose circuits when the line switch is in the deenergized and in the energized position. The interlock switch LS-out serves to short-circuit the resistor 11 when the line switch LS is released, and the interlock switch LSin serves to com plete a holding circuit through the coil 13 when the controller is moved to position 7) or position 0, and the interlock switch 8 is opened. 7

The overload-trip switch OT is adapted to bridge a pair of contact terminals 16,

when in the released position, and to bridge: a pair of cont-act terminals 17, when in The overload-trip switch embodies an energizing coil 18 which the operative position;

is inserted in series with the motors M1 and M2, and a holding coil 19 which is energized in shunt to the resistor 12, when the over load-trip switch is energized to bridge contact terminals 17.

A circuit, comprising a door-interlock switch 20, a signaling means 21 and a resistor 22, is connected across the supply circuit in shunt to the slip segment 9 and to'the resistors lO and 11.

Assuming the doors of the vehicle to be 7 .closed, the vehicle is operated by movingthe switch OT, coil 13 and the interlock switches V sistor 12. Thus, the line switch LS is opercontroller to position (a for completing a circuitfrom the supply conductor 1 through the slip segment 9, the resistors 10, 11 and 12to theground conductor g. The coil 13 of the line switch LS is energized by a circuit which may be traced from one terminal of the resistor 12 through the overload-trip 15, 14: and 8 to the other terminal of the reated to connect the motors M1 and'M2jacross the supply conductors 1 and g. Asset forth I above,the interlock switch LS-but is ar-- ranged tor short-circuitingthe resistor 11, when the line'switch LS is open, to increase the current flowing through the resistor 12 and the voltage applied across the terminals of the coil 13. v Thus, the closing of the line switch LS is insured when the voltage of the supply circuit is low, and, when the line switch is operated, the short circuit around the resistor 11 is'broken to reduce the voltage supplied to the terminalsor" the coil 13; When the controller is moved through positions I) and 0, the various portions of the resistor 2 are successively excluded from circuit to accelerate the motors, When the con troller is moved to position b, the interlock switch 8 is opened but the circuit of the coil 13 is not broken by reason of the closing of through the coil of the line switch bymeans of the drum interlock switch 8. The opening of a vehicle door completes a circuit through the indicating lamp 21 so as to no tify the operator of the vehicle that adoor is open, whether the controller MO is in the off or in an operating position. When the controller is in the off position and a door is opened, the lamp 21 is connected in series with the resistor 12 across the supply circuit by means of the interlock switch 20. In case a door of the vehicle "is opened when the controller is in" an operating position, the lamp 21 is energized in shunt to the resistors 10 and 11. V 1

hen the vehicle is at rest the controller MC may be moved to position a, sothat the vehicle will be started in motion whenever the doors thereof are closed.

In case the controller is in position Z) or c, and the motors utilize an excessive cur-- rent, the coil 18 of the overload-trip switch.

OT will be energized to operate the switch OT and break the circuit of the coil 13 of the line switch LS. lVhen the line switch LS is operated to break the circuit of the coil 13,

but the interlock switch 8 is now closed, and, unless the overload-trip switch is held in an operative position, the line switch LS will again'be operatedupon the bridging of the contact termlnals 16 by means of the overload-trio SWltCh OT. In, orderto prevent,

the intermittent energization of the coil 13 of the line switch, when the controller MC is in the initial position, the holding coil 19 of the switch OT is energized in shunt to Y the resistor 12 by'a circuit including the contact terminals 17 which are bridged by the overload-trip switch OT.

Modifications 1n the system and arrangement and location of parts may be nade;

within the spirit and scope of my invention and such modifications are intended to be covered by the appenced claims.

I claim as my invention:

1. In a system of control for an electric vehicle, the combination with a supply circuit and a plurality of resistors connected across the supply circuit, of an indicating means, a switch for connecting the indicat ing means in series with certain of said resistors when a vehicle door is opened, and a line switch having a coil energized in shunt to a portion of said resistors.

2. In a system of control for an electric vehicle, the combination with a supply circuit, a plurality of resistors connected across the supply circuit, an electric motor, and a line switch for connecting the motor across the supply circuit, said line switch having an operating coil connected in shunt to a portion of said resistors, of means for automatically releasing the line switch to deenergize the motor in case a door of the vehicle is opened or an excessive current is utilized by the motor.

3. In system of control for an electric vehicle, the combination with a supply circuit and a plurality of resistors connected across the supply circuit, of an electric motor, a line switch for connecting said motor across the supply circuit, said line switch having an operating coil energized in shunt to a portion of said resistors, and an interlock switch controlled by said line switch for short-circuiting a portion of said resistors when the line switch is deenergized.

4;. In a system of control for an electric vehicle, the combination with a supply circuit and a plurality of resistors connected across the supply circuit, of an electric switch having an operating coil, means for connecting said coil in shunt to a portion of said resistors, and means for reducing the voltage supplied to the coil of said switch when the switch is operated.

5. In a system of control for an electric vehicle, the combination with a supply circuit, a plurality of resistors connected across the supply circuit, a line switch, a circuit in shunt to a portion of said resis tors and comprising a coil of said line switch and a trip switch, and a motor adapted to be connected across the supply circuit by said line switch, oi means. comprising said trip switch for releasing the line switch to denergize the motor in case an excess current be utilized by the motor.

6. In a system of control for an electric vehicle, the combination with a supply circuit, a plurality of resistors connected across the supply circuit, a motor, and a line switch for connecting said motor across the supply circuit, of a trip switch connect ed in series with the energizin c switch and in shunt to resistors, a holding switch, said holding coil being adapted to be energized in shunt to a portion of said resistors, under predetermined conditions.

7. In a system of control for an electric vehicle, the combination with a supply cir cuit and a plurality of resistors connected across the supply circuit, of a signal light, a line switch having an energizing coil, and door-interlock switches for severally connecting the signal light and said coil in shunt to portions of said resistors.

8. In a. system of control for an electric vehicle, the combination with a supply circuit, a plurality of resistors connected across the supply circuit, a motor, a line switch for connecting the motor across the supply circuit, and a controller for governing the operation of the motor, of a plurality of door-interlock switches for connecting the coil of said line switch in shunt to a portion of said resistors when the controller is in its first position.

9. In a system of control for an electric vehicle, the combination with a supply circuit and a plurality of resistors connected across the supply circuit, of a motor, a switch for connecting the motor across the supply circuit, and interlock switches for connecting the coil of said switch in shunt to a portionof said resistors.

10. In a system of control for an electric vehicle, the combination with a supply circuit and a plurality'of resistors connected across the supply circuit, of a motor, a line switch for connecting the motor across the supply circuit, interlock switches for selectively connecting the coil ofsaid line switch in shunt to a portion of said resistors, and a trip switch in circuit with the coil of said line switch, said trip switch having an energizng coil in series with the motor and a holding coil adapted to be connected in shunt to a portion of said resistors.

11. In a system of control for an electric vehicle, the combination with a supply circuit, a plurality of resistors connected across the supply circuit, a motor, a line switch for connecting the motor across the supply circuit, a signal light, and means for connecting the signal light in series with, and

in shunt to, portions of said resistors when a door or the vehicle is opened, of means governed by a controller and the doors of the vehicle for connecting a coil of said line switch in shunt to a portion of said resistors, a trip switch in series with the coil of the line switch and having a holding coil adapted to be connected in shunt to a portion oi said resistors when the trip switch is operated, and an interlock switch associated with the line switch-for shor circuiting a portion of said resistors when the line switch is deenergized.

i In a system of control for electric vehicle, the combination with a plurality 7 opening movement for connecting said indi- Gating means 1n circuit with said translat- 111g devices.

of translating devices, of indicating means,

and means responsive to the vehicle-door 18. In a system of control for an electric vehicle, the combination with a plurality of translating devices, of indicating means,

means'responsive to vehicle-door movement for connecting said indicating means in circuit with said translating devices, and a motor-controlling switching device having actuating means energized from said translating devices.

' 14; In a system of control for an electric vehicle,'the combination with a plurality of resistors and an electric motor, of a motorcontrolling switch having an actuating coil energized from said resistors, and means for automatically releasing said switch in re-. sponse to a predetermined movement of a vehicledoor. V r

15. In a system of control for an electric vehicle, the combination with a plurality of resistors and an electric motor, of amotorresistors when the controller occupies a pre-' determined position.

In testimony whereof I have hereunto subscribed my namethis 29th day'of Janu- V ary, 1917 7 PAUL L. Mime. 

